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You really need to get out and do some geology on the area before it can be confirmed. Shocked quartz grains, shatter cones and/or shatter surfaces, breccia from the thrown out material as well as the glassy melt (I've forgotten the name!) that forms in cracked rocks and in some cases minute diamonds are all signs of an impact. Without at least one of these as hard proof it will likely remain a 'maybe'.
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